As I arrived I could see a crowd outside the shop waiting for the grand opening by Warwick Davis, who plays Professor Flitwick and Griphook the goblin. There were peering necks and eager faces - a mixture of press, public and, of course, very excitable children. I guess we Potter fans will cling to any new kind of content, especially as the last film was over a year ago and the last book was published five years ago.

For me, the hardest thing to do was to act professional and not skip about singing along with the theme song playing from the shop. Instead, I held on tight to my notebook and pen and tried to keep my face as straight as possible.

The shop is similarly styled to the wand shop imagined by JK Rowling, Ollivander's. It is wooden panelled with lots of drawers and even has similar light fixtures. Though it's not as dimly lighted and, sadly, the staff don't come up to you and say: "The wand choses the wizard," as you look around.

You can buy a generic Ollivander's wand or replicas of the wands used by the cast in the films - Harry's, Ron's, Hermione's, the professors', or even the Triwizard champions' wands. The prices vary but the cheapest was £22.99. It seems expensive but, if you have searched for Potter merchandise online before, this is pretty standard. The shop is under license from Warner Brothers so it makes sense that the prices match up.

There are also collectable items such as a time turner, a small Triwizard cup and - something I thought was really cool - a display of Horcruxes. You could buy the ring or the locket, again rather pricey but, at the same time, very tempting. Especially the time turner.

My personal favourite of the shop were the jumpers. You can buy jumpers in the house colours – such as red and yellow for Gryffindor – or the grey school uniform style jumper or cardigan. It's £59.99 for a cardigan, which I personally feel is too much, even if it is cashmere.

If you want to go full out, you can buy yourself a set of robes. Or if you wish to show your love of Harry Potter but in perhaps in a slightly more subtle way you can buy hoodies in various colours with Platform 9 3/4 written on them – which are exclusive and never been seen before, according to the owner, Jonathan Sands.

Sands stressed the point that the shop has something for everyone and I have to say that I agree with him. Expensive collectable and clothing items aside, there is much more affordable merchandise - board games, key rings, mugs, soft toys, action figures - which are clearly aiming for a younger audience or general browser.

As one of of the Harry Potter generation, I really enjoyed looking around the shop - anything new to do with the franchise is bound to make me a little giddy. Once I got over the initial excitement, I looked at it through the eyes as a general member of the public and I still think it's a good thing. It's great for kids and tourists and the trolley stuck between the walls of platform nine and ten has now been moved to next to the shop so a little corner of King's Cross station has become a fun – and totally free, if you don't shell out in the shop - Harry Potter attraction.

I don't see the harm in creating a little childish excitement at King's Cross, which is known around the world as the place the boy wizard's journey began.